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diff --git a/Electronic_Communication_Systems/Chapter5.ipynb b/Electronic_Communication_Systems/Chapter5.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:41db786e06a01c332ebd11f188e721e6640c124416532b39896420ba483ab6cd"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 5: Pulse Modulation Techniques "
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 5.1, page no. 107"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variable Declaration\n",
+      "F_m = 4.00*pow(10,3)   # Maximum Frequency Component in Message Signal (Hz)\n",
+      "\n",
+      "# Calculation\n",
+      "import math            # Math Library\n",
+      "F_s = 2*F_m\t       # Minimum Sampling Frequency using Sampling Theorem (Hz)\n",
+      "\n",
+      "# Result\n",
+      "print \"F_s >=(greater than or equal to)\",F_s/pow(10,3),\"kHz\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "F_s >=(greater than or equal to) 8.0 kHz\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 5.2, page no. 107"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variable Declaration\n",
+      "F1  = 500           # Single Tone Sine Wave Frequency in Message Signal (Hz)\n",
+      "F2  = 750           # Lowest Value Sound Frequency in Message Signal (Hz)\n",
+      "F3  = 1800          # Highest Value Sound Frequency in Message Signal (Hz)\n",
+      "\n",
+      "# Calculation\n",
+      "import math\t    # Math Library\n",
+      "F_m = max(F1,F2,F3) # Maximum Frequency Component (Hz)\n",
+      "F_s = 2*F_m\t    # Minimum Sampling Frequency using Sampling Theorem (Hz)\n",
+      "\n",
+      "# Result\n",
+      "print \"F_s >=(greater than or equal to)\",F_s,\"Hz\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "F_s >=(greater than or equal to) 3600 Hz\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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